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Cheap flights from London to Southeast Asia from €303

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Southeast Asia departing on 16/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London to Southeast Asia

Cheap return flights

Enter your travel dates to find the best prices.
Air China Logo
17:40 - 18:05
LHR
-
BKK
17h 25m
1 stop
Air China Logo
01:30 - 15:55
BKK
-
LHR
21h 25m
1 stop
€463Air China
Tue, 3 Mar - Thu, 12 Mar
Air India Logo
13:30 - 13:35
LHR
-
BKK
17h 05m
1 stop
Air India Logo
20:50 - 11:05
BKK
-
LHR
21h 15m
1 stop
€466Air India
Mon, 2 Mar - Wed, 11 Mar
Air India Logo
20:30 - 19:35
LHR
-
BKK
16h 05m
1 stop
Air India Logo
20:50 - 11:05
BKK
-
LHR
21h 15m
1 stop
€467Air India
Wed, 4 Mar - Wed, 11 Mar
China Eastern Logo
21:00 - 00:55
LHR
-
BKK
20h 55m
1 stop
China Eastern Logo
21:55 - 18:40
BKK
-
LHR
26h 45m
1 stop
€472China Eastern
Wed, 4 Mar - Fri, 3 Apr
China Eastern Logo
21:00 - 22:45
LHR
-
HKT
18h 45m
1 stop
China Eastern Logo
23:05 - 18:40
HKT
-
LHR
25h 35m
1 stop
€473China Eastern
Sat, 14 Mar - Sun, 29 Mar
SWISS Logo
18:40 - 18:00
LGW
-
SIN
15h 20m
1 stop
SWISS Logo
23:25 - 08:25
SIN
-
LGW
16h 00m
1 stop
€557SWISS
Sat, 7 Mar - Thu, 11 Jun
Shenzhen Airlines Logo
21:10 - 01:40
LHR
-
MNL
20h 30m
1 stop
Shenzhen Airlines Logo
02:55 - 19:10
MNL
-
LHR
24h 15m
1 stop
€558Shenzhen Airlines
Fri, 6 Mar - Thu, 26 Mar
Gulf Air Logo
10:35 - 12:50
LGW
-
SIN
18h 15m
1 stop
Gulf Air Logo
20:00 - 06:20
SIN
-
LGW
18h 20m
1 stop
€561Gulf Air
Wed, 18 Feb - Thu, 12 Mar
Shenzhen Airlines Logo
21:10 - 01:40
LHR
-
MNL
20h 30m
1 stop
Shenzhen Airlines Logo
02:55 - 19:10
MNL
-
LHR
24h 15m
1 stop
€562Shenzhen Airlines
Wed, 4 Mar - Thu, 26 Mar
SWISS Logo
18:35 - 17:10
LGW
-
SIN
15h 35m
1 stop
SWISS Logo
23:25 - 08:20
SIN
-
LGW
15h 55m
1 stop
€564SWISS
Fri, 8 May - Tue, 19 May

China Eastern flights from London to Southeast Asia

Our best China Eastern deals on London to Southeast Asia flight tickets
China Eastern
26 Jan
LHR21:00London Heathrow
18h 25m
1 stop
BKK22:25Bangkok Suvarnabhumi
4 Feb
BKK05:45Bangkok Suvarnabhumi
18h 45m
1 stop
LHR17:30London Heathrow
€471
China Eastern
4 Mar
LHR21:00London Heathrow
20h 55m
1 stop
BKK00:55Bangkok Suvarnabhumi
3 Apr
BKK21:55Bangkok Suvarnabhumi
26h 45m
1 stop
LHR18:40London Heathrow
€472
China Eastern
17 Feb
LHR21:00London Heathrow
24h 45m
1 stop
BKK04:45Bangkok Suvarnabhumi
31 Mar
BKK21:55Bangkok Suvarnabhumi
26h 45m
1 stop
LHR18:40London Heathrow
€473

Air India flights from London to Southeast Asia

Our best Air India deals on London to Southeast Asia flight tickets
Air India
14 Apr
LHR21:45London Heathrow
27h 35m
1 stop
HKT07:20Phuket City
28 Apr
HKT08:20Phuket City
16h 40m
1 stop
LHR19:00London Heathrow
€515
Air India
24 Feb
LHR13:00London Heathrow
20h 55m
1 stop
BKK16:55Bangkok Suvarnabhumi
24 Mar
BKK14:45Bangkok Suvarnabhumi
27h 20m
1 stop
LHR11:05London Heathrow
€516
Air India
14 Apr
LHR20:35London Heathrow
28h 45m
1 stop
HKT07:20Phuket City
28 Apr
HKT08:20Phuket City
16h 40m
1 stop
LHR19:00London Heathrow
€518

momondo Fare Finder

 
Customise your flight search to find flights from London to Southeast Asia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 13,528 searches. Data last updated 25 January 2026.
Use the filters below to find and compare flights from London to Southeast Asia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Tue 3/3

17:40-18:05

1 stop17h 25m

Bangkok Suvarnabhumi

Thu 12/3

01:30-15:55

1 stop21h 25m

€463

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Mon 2/3

13:30-13:35

1 stop17h 05m

Bangkok Suvarnabhumi

Wed 11/3

20:50-11:05

1 stop21h 15m

€466

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 4/3

20:30-19:35

1 stop16h 05m

Bangkok Suvarnabhumi

Wed 11/3

20:50-11:05

1 stop21h 15m

€467

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Wed 4/3

21:00-00:55

1 stop20h 55m

Bangkok Suvarnabhumi

Fri 3/4

21:55-18:40

1 stop26h 45m

€472

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Sat 14/3

21:00-22:45

1 stop18h 45m

Phuket City

Sun 29/3

23:05-18:40

1 stop25h 35m

€473

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Sat 7/3

18:40-18:00

1 stop15h 20m

Singapore Changi

Thu 11/6

23:25-08:25

1 stop16h 00m

€557

LondonManila

LHR - MNL

LHRMNL

London Heathrow

Fri 6/3

21:10-01:40

1 stop20h 30m

Manila Ninoy Aquino Intl

Thu 26/3

02:55-19:10

1 stop24h 15m

€558

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Wed 18/2

10:35-12:50

1 stop18h 15m

Singapore Changi

Thu 12/3

20:00-06:20

1 stop18h 20m

€561

LondonManila

LHR - MNL

LHRMNL

London Heathrow

Wed 4/3

21:10-01:40

1 stop20h 30m

Manila Ninoy Aquino Intl

Thu 26/3

02:55-19:10

1 stop24h 15m

€562

LondonSingapore

LGW - SIN

LGWSIN

London Gatwick

Fri 8/5

18:35-17:10

1 stop15h 35m

Singapore Changi

Tue 19/5

23:25-08:20

1 stop15h 55m

€564

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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See travel insights to Southeast Asia from

How to get the cheapest flight ticket from London to Southeast Asia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Southeast Asia?

The cheapest month to fly to Southeast Asia from London is in May. Flight prices, which tend to average around €443, are often lower during this time because this is during the off-season. If you’re not able to fly to Southeast Asia in May, then September is your next best option. Flight prices from London to Southeast Asia during September average around €614.

What is the cheapest day to depart on your flight to Southeast Asia?

The cheapest day to depart from London to Southeast Asia is on a Wednesday. Travellers who choose to depart for Southeast Asia on a Wednesday will often find tickets for as low as €779. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around €1,127. These prices are subject to change though, so be sure to set up a Price Alert for flights to Southeast Asia.

What is the cheapest time of day to depart on your flight to Southeast Asia?

Our most recent data shows that the best time of day to fly to Southeast Asia is in the evening. Flights from London to Southeast Asia during this time can be as low as €823. Flights to Southeast Asia are more costly in the morning, with an average ticket price of €825. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest London to Southeast Asia flight route?

Fly from London Heathrow to Bangkok Suvarnabhumi for the best London - Southeast Asia flight prices

How far in advance should I book a flight to Southeast Asia?

You are more likely to see cheaper flights to Southeast Asia from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia for around €792 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Southeast Asia from London for as low as €740 on momondo.

What cabin class options are available on London to Southeast Asia flights?

There are 3 cabin classes available to choose from on London to Southeast Asia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to Southeast Asia flights?

No. A direct flight is the cheapest option for a flight between London to Southeast Asia.

Cheap London to Southeast Asia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Southeast Asia

Fastest flight time

11h 40m

Direct flights

Every day

Airports in Southeast Asia

295 airports
The fastest flight from London to Southeast Asia takes 11h 40m
Direct flights go from London to Southeast Asia every day.
There are 295 airports in Southeast Asia. From London there are direct flights to Bangkok Suvarnabhumi (BKK).
Search flight deals

  • When did momondo last update prices for flights from London to Southeast Asia?

    Prices for flights from London to Southeast Asia refresh daily.

  • How many operators does momondo search for flights from London to Southeast Asia?

  • How old do you have to be to fly from London to Southeast Asia?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Southeast Asia.

  • What documentation or ID do you need to fly to Southeast Asia?

    The travel and health documents you'll need for your trip to Southeast Asia may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Southeast Asia. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London to Southeast Asia?

Best airlines flying from London to Southeast Asia

Compare and see reviews for airlines that fly from London to Southeast Asia with momondo
Airline
Rating
Free Cancellation
Price
Air ChinaPriceFrom €438Free CancellationRating
7.2
138 reviews
Search Air China flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Southeast Asia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Southeast Asia . Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from London to Southeast Asia with flexible booking policies on momondo?

All flight searches from London to Southeast Asia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from London to Southeast Asia?

momondo provides multiple filters to help you find the best flight to Southeast Asia from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from London to Southeast Asia right now. Can momondo alert me if prices change?

Yes. momondo can track prices for London to Southeast Asia flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Find better results for your trip to Southeast Asia

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Popular flights according to clicks in the last 7 days on momondo
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